None exit code even after wait_finished()

[ArthurGarnier]

Describe the bug
After running a command with SSHClient.run_command(), then waiting with wait_finished(), the exit code is sometimes None

To Reproduce

Unfortulatly I'm not able to reproduce, it happens very rarely.
But this is how I tried to reproduce, which depict how I'm using the lib in real world :

import os
import getpass
from pssh.clients import SSHClient

_pass = getpass.getpass()

for i in range(200):
    print(f"Try {i}")
    client = SSHClient("lgwebsi1", user=os.getlogin(), password=_pass)
    command = "sudo -S curl --haproxy-protocol -sk -o /dev/null -w '%{http_code}' https://localhost/health"
    host_io = client.run_command(command)
    host_io.stdin.write(f"{_pass}\n")
    host_io.stdin.flush()
    client.wait_finished(host_io)
    returncode = host_io.exit_code
    if returncode is None:
        print("Failed")

This command is an example, it happens with various commands, and not always the same.

Expected behavior
Getting exit code

Actual behaviour
exit code is None

Screenshots
If applicable, add screenshots to help explain your problem.

Additional information
parallel-ssh 2.16.0.post1
ssh2-python 1.2.0.post1
Python 3.12.13

[yangfan-yf-yf]

Thanks for the report. I traced the path in the current code: the default pssh.clients.SSHClient uses the native/libssh2 client, where wait_finished() waits for channel.wait_eof() and HostOutput.exit_code returns None when channel.eof() is still false.

Could you capture the following only on a failing iteration, immediately after wait_finished()?

print('channel.eof:', host_io.channel.eof())
print('channel.exit_status:', host_io.channel.get_exit_status())

Please also include the OS and ssh2-python version, and whether this happens only with a newly created client as in the example or also when reusing an existing client. This should distinguish an EOF/wait race from a missing exit-status reply without exposing the password or host details.